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Message-ID: <20090508064048.3de3862c@pedra.chehab.org>
Date: Fri, 8 May 2009 06:40:48 -0300
From: Mauro Carvalho Chehab <mchehab@...hat.com>
To: Borislav Petkov <borislav.petkov@....com>
Cc: <akpm@...ux-foundation.org>, <greg@...ah.com>, <mingo@...e.hu>,
<norsk5@...oo.com>, <tglx@...utronix.de>, <hpa@...or.com>,
<aris@...hat.com>, edt@....ca, <linux-kernel@...r.kernel.org>,
Doug Thompson <dougthompson@...ssion.com>,
Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 17/21] amd64_edac: add ECC chipkill syndrome mapping
table
Em Thu, 7 May 2009 15:49:39 +0200
Borislav Petkov <borislav.petkov@....com> escreveu:
> From: Doug Thompson <dougthompson@...ssion.com>
>
> Signed-off-by: Doug Thompson <dougthompson@...ssion.com>
> Signed-off-by: Borislav Petkov <borislav.petkov@....com>
Reviewed-by: Mauro Carvalho Chehab <mchehab@...hat.com>
> ---
> drivers/edac/amd64_edac.c | 140 +++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 140 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index c6c8d6b..68fc717 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -2084,4 +2084,144 @@ static struct pci_dev *pci_get_related_function(unsigned int vendor,
> return dev;
> }
>
> +/*
> + * syndrome mapping table for ECC ChipKill devices
> + *
> + * The comment in each row is the token (nibble) number that is in error.
> + * The least significant nibble of the syndrome is the mask for the bits
> + * that are in error (need to be toggled) for the particular nibble.
> + *
> + * Each row contains 16 entries.
> + * The first entry (0th) is the channel number for that row of syndromes.
> + * The remaining 15 entries are the syndromes for the respective Error
> + * bit mask index.
> + *
> + * 1st index entry is 0x0001 mask, indicating that the rightmost bit is the
> + * bit in error.
> + * The 2nd index entry is 0x0010 that the second bit is damaged.
> + * The 3rd index entry is 0x0011 indicating that the rightmost 2 bits
> + * are damaged.
> + * Thus so on until index 15, 0x1111, whose entry has the syndrome
> + * indicating that all 4 bits are damaged.
> + *
> + * A search is performed on this table looking for a given syndrome.
> + *
> + * See the AMD documentation for ECC syndromes. This ECC table is valid
> + * across all the versions of the AMD64 processors.
> + *
> + * A fast lookup is to use the LAST four bits of the 16-bit syndrome as a
> + * COLUMN index, then search all ROWS of that column, looking for a match
> + * with the input syndrome. The ROW value will be the token number.
> + *
> + * The 0'th entry on that row, can be returned as the CHANNEL (0 or 1) of this
> + * error.
> + */
> +#define NUMBER_ECC_ROWS 36
> +static const unsigned short ecc_chipkill_syndromes[NUMBER_ECC_ROWS][16] = {
> + /* Channel 0 syndromes */
> + {/*0*/ 0, 0xe821, 0x7c32, 0x9413, 0xbb44, 0x5365, 0xc776, 0x2f57,
> + 0xdd88, 0x35a9, 0xa1ba, 0x499b, 0x66cc, 0x8eed, 0x1afe, 0xf2df },
> + {/*1*/ 0, 0x5d31, 0xa612, 0xfb23, 0x9584, 0xc8b5, 0x3396, 0x6ea7,
> + 0xeac8, 0xb7f9, 0x4cda, 0x11eb, 0x7f4c, 0x227d, 0xd95e, 0x846f },
> + {/*2*/ 0, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
> + 0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f },
> + {/*3*/ 0, 0x2021, 0x3032, 0x1013, 0x4044, 0x6065, 0x7076, 0x5057,
> + 0x8088, 0xa0a9, 0xb0ba, 0x909b, 0xc0cc, 0xe0ed, 0xf0fe, 0xd0df },
> + {/*4*/ 0, 0x5041, 0xa082, 0xf0c3, 0x9054, 0xc015, 0x30d6, 0x6097,
> + 0xe0a8, 0xb0e9, 0x402a, 0x106b, 0x70fc, 0x20bd, 0xd07e, 0x803f },
> + {/*5*/ 0, 0xbe21, 0xd732, 0x6913, 0x2144, 0x9f65, 0xf676, 0x4857,
> + 0x3288, 0x8ca9, 0xe5ba, 0x5b9b, 0x13cc, 0xaded, 0xc4fe, 0x7adf },
> + {/*6*/ 0, 0x4951, 0x8ea2, 0xc7f3, 0x5394, 0x1ac5, 0xdd36, 0x9467,
> + 0xa1e8, 0xe8b9, 0x2f4a, 0x661b, 0xf27c, 0xbb2d, 0x7cde, 0x358f },
> + {/*7*/ 0, 0x74e1, 0x9872, 0xec93, 0xd6b4, 0xa255, 0x4ec6, 0x3a27,
> + 0x6bd8, 0x1f39, 0xf3aa, 0x874b, 0xbd6c, 0xc98d, 0x251e, 0x51ff },
> + {/*8*/ 0, 0x15c1, 0x2a42, 0x3f83, 0xcef4, 0xdb35, 0xe4b6, 0xf177,
> + 0x4758, 0x5299, 0x6d1a, 0x78db, 0x89ac, 0x9c6d, 0xa3ee, 0xb62f },
> + {/*9*/ 0, 0x3d01, 0x1602, 0x2b03, 0x8504, 0xb805, 0x9306, 0xae07,
> + 0xca08, 0xf709, 0xdc0a, 0xe10b, 0x4f0c, 0x720d, 0x590e, 0x640f },
> + {/*a*/ 0, 0x9801, 0xec02, 0x7403, 0x6b04, 0xf305, 0x8706, 0x1f07,
> + 0xbd08, 0x2509, 0x510a, 0xc90b, 0xd60c, 0x4e0d, 0x3a0e, 0xa20f },
> + {/*b*/ 0, 0xd131, 0x6212, 0xb323, 0x3884, 0xe9b5, 0x5a96, 0x8ba7,
> + 0x1cc8, 0xcdf9, 0x7eda, 0xafeb, 0x244c, 0xf57d, 0x465e, 0x976f },
> + {/*c*/ 0, 0xe1d1, 0x7262, 0x93b3, 0xb834, 0x59e5, 0xca56, 0x2b87,
> + 0xdc18, 0x3dc9, 0xae7a, 0x4fab, 0x542c, 0x85fd, 0x164e, 0xf79f },
> + {/*d*/ 0, 0x6051, 0xb0a2, 0xd0f3, 0x1094, 0x70c5, 0xa036, 0xc067,
> + 0x20e8, 0x40b9, 0x904a, 0x601b, 0x307c, 0x502d, 0x80de, 0xe08f },
> + {/*e*/ 0, 0xa4c1, 0xf842, 0x5c83, 0xe6f4, 0x4235, 0x1eb6, 0xba77,
> + 0x7b58, 0xdf99, 0x831a, 0x27db, 0x9dac, 0x396d, 0x65ee, 0xc12f },
> + {/*f*/ 0, 0x11c1, 0x2242, 0x3383, 0xc8f4, 0xd935, 0xeab6, 0xfb77,
> + 0x4c58, 0x5d99, 0x6e1a, 0x7fdb, 0x84ac, 0x956d, 0xa6ee, 0xb72f },
> +
> + /* Channel 1 syndromes */
> + {/*10*/ 1, 0x45d1, 0x8a62, 0xcfb3, 0x5e34, 0x1be5, 0xd456, 0x9187,
> + 0xa718, 0xe2c9, 0x2d7a, 0x68ab, 0xf92c, 0xbcfd, 0x734e, 0x369f },
> + {/*11*/ 1, 0x63e1, 0xb172, 0xd293, 0x14b4, 0x7755, 0xa5c6, 0xc627,
> + 0x28d8, 0x4b39, 0x99aa, 0xfa4b, 0x3c6c, 0x5f8d, 0x8d1e, 0xeeff },
> + {/*12*/ 1, 0xb741, 0xd982, 0x6ec3, 0x2254, 0x9515, 0xfbd6, 0x4c97,
> + 0x33a8, 0x84e9, 0xea2a, 0x5d6b, 0x11fc, 0xa6bd, 0xc87e, 0x7f3f },
> + {/*13*/ 1, 0xdd41, 0x6682, 0xbbc3, 0x3554, 0xe815, 0x53d6, 0xce97,
> + 0x1aa8, 0xc7e9, 0x7c2a, 0xa1fb, 0x2ffc, 0xf2bd, 0x497e, 0x943f },
> + {/*14*/ 1, 0x2bd1, 0x3d62, 0x16b3, 0x4f34, 0x64e5, 0x7256, 0x5987,
> + 0x8518, 0xaec9, 0xb87a, 0x93ab, 0xca2c, 0xe1fd, 0xf74e, 0xdc9f },
> + {/*15*/ 1, 0x83c1, 0xc142, 0x4283, 0xa4f4, 0x2735, 0x65b6, 0xe677,
> + 0xf858, 0x7b99, 0x391a, 0xbadb, 0x5cac, 0xdf6d, 0x9dee, 0x1e2f },
> + {/*16*/ 1, 0x8fd1, 0xc562, 0x4ab3, 0xa934, 0x26e5, 0x6c56, 0xe387,
> + 0xfe18, 0x71c9, 0x3b7a, 0xb4ab, 0x572c, 0xd8fd, 0x924e, 0x1d9f },
> + {/*17*/ 1, 0x4791, 0x89e2, 0xce73, 0x5264, 0x15f5, 0xdb86, 0x9c17,
> + 0xa3b8, 0xe429, 0x2a5a, 0x6dcb, 0xf1dc, 0xb64d, 0x783e, 0x3faf },
> + {/*18*/ 1, 0x5781, 0xa9c2, 0xfe43, 0x92a4, 0xc525, 0x3b66, 0x6ce7,
> + 0xe3f8, 0xb479, 0x4a3a, 0x1dbb, 0x715c, 0x26dd, 0xd89e, 0x8f1f },
> + {/*19*/ 1, 0xbf41, 0xd582, 0x6ac3, 0x2954, 0x9615, 0xfcd6, 0x4397,
> + 0x3ea8, 0x81e9, 0xeb2a, 0x546b, 0x17fc, 0xa8bd, 0xc27e, 0x7d3f },
> + {/*1a*/ 1, 0x9891, 0xe1e2, 0x7273, 0x6464, 0xf7f5, 0x8586, 0x1617,
> + 0xb8b8, 0x2b29, 0x595a, 0xcacb, 0xdcdc, 0x4f4d, 0x3d3e, 0xaeaf },
> + {/*1b*/ 1, 0xcce1, 0x4472, 0x8893, 0xfdb4, 0x3f55, 0xb9c6, 0x7527,
> + 0x56d8, 0x9a39, 0x12aa, 0xde4b, 0xab6c, 0x678d, 0xef1e, 0x23ff },
> + {/*1c*/ 1, 0xa761, 0xf9b2, 0x5ed3, 0xe214, 0x4575, 0x1ba6, 0xbcc7,
> + 0x7328, 0xd449, 0x8a9a, 0x2dfb, 0x913c, 0x365d, 0x688e, 0xcfef },
> + {/*1d*/ 1, 0xff61, 0x55b2, 0xaad3, 0x7914, 0x8675, 0x2ca6, 0xd3c7,
> + 0x9e28, 0x6149, 0xcb9a, 0x34fb, 0xe73c, 0x185d, 0xb28e, 0x4def },
> + {/*1e*/ 1, 0x5451, 0xa8a2, 0xfcf3, 0x9694, 0xc2c5, 0x3e36, 0x6a67,
> + 0xebe8, 0xbfb9, 0x434a, 0x171b, 0x7d7c, 0x292d, 0xd5de, 0x818f },
> + {/*1f*/ 1, 0x6fc1, 0xb542, 0xda83, 0x19f4, 0x7635, 0xacb6, 0xc377,
> + 0x2e58, 0x4199, 0x9b1a, 0xf4db, 0x37ac, 0x586d, 0x82ee, 0xed2f },
> +
> + /* ECC bits are also in the set of tokens and they too can go bad
> + * first 2 cover channel 0, while the second 2 cover channel 1
> + */
> + {/*20*/ 0, 0xbe01, 0xd702, 0x6903, 0x2104, 0x9f05, 0xf606, 0x4807,
> + 0x3208, 0x8c09, 0xe50a, 0x5b0b, 0x130c, 0xad0d, 0xc40e, 0x7a0f },
> + {/*21*/ 0, 0x4101, 0x8202, 0xc303, 0x5804, 0x1905, 0xda06, 0x9b07,
> + 0xac08, 0xed09, 0x2e0a, 0x6f0b, 0x640c, 0xb50d, 0x760e, 0x370f },
> + {/*22*/ 1, 0xc441, 0x4882, 0x8cc3, 0xf654, 0x3215, 0xbed6, 0x7a97,
> + 0x5ba8, 0x9fe9, 0x132a, 0xd76b, 0xadfc, 0x69bd, 0xe57e, 0x213f },
> + {/*23*/ 1, 0x7621, 0x9b32, 0xed13, 0xda44, 0xac65, 0x4176, 0x3757,
> + 0x6f88, 0x19a9, 0xf4ba, 0x829b, 0xb5cc, 0xc3ed, 0x2efe, 0x58df }
> +};
>
> +/*
> + * get_channel_from_ecc_syndrome
> + *
> + * given the syndrome argument, scan each of the channel tables
> + * looking for a syndrome match. Depending on which table it is
> + * found, return the channel number
> + */
> +static int get_channel_from_ecc_syndrome(unsigned short syndrome)
> +{
> + int row;
> + int column;
> +
> + debugf0("%s()\n", __func__);
> +
> + /* Determine column to scan */
> + column = syndrome & 0xF;
> +
> + /* Scan all rows, looking for syndrome, or end of table */
> + for (row = 0; row < NUMBER_ECC_ROWS; row++) {
> + if (ecc_chipkill_syndromes[row][column] == syndrome)
> + return ecc_chipkill_syndromes[row][0];
> + }
> +
> + debugf0("%s(): syndrome(%x) not found\n", __func__, syndrome);
> + return -1;
> +}
--
Cheers,
Mauro
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